Combustion and stability characteristics of ultra-compact combustor using cavity for gas turbines

Zhang, Rongchun; Hao, Fei; Fan, Weijun

doi:10.1016/j.apenergy.2018.05.084

Cited by 30 publications

(6 citation statements)

References 37 publications

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“…Similar to the designs of K Agarwal et al and Abhinav Sinha et al , the geometry has guide vanes for controlling air flow into the cavity. In certain geometries of rectangular combustor with cavities, bluff bodies were present along the center line of combustor (Zeng et al , 2015, Zhang et al , 2018a, 2018b). The strut height was changed in further modification in the work of Wang et al (2015) and struts were removed in the work of Jiang et al (2015).…”

Section: Evolution Of Trapped Vortex Combustor Geometrymentioning

confidence: 99%

A review of computational studies on trapped vortex combustors for gas turbine applications

Narayanan

K.M.²

2022

AEAT

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Purpose The purpose of this paper is to comprehensively evaluate the progress in the development of trapped vortex combustors (TVCs) in the past three decades. The review aims to identify the needs, predict the scope and discuss the challenges of numerical simulations in TVCs applied to gas turbines. Design/methodology/approach TVC is an emerging combustion technology for achieving low emissions in gas turbine combustors. The overall operation of such TVCs can be on very lean mixture ratio and hence it helps in achieving high combustion efficiency and low overall emission levels. This review introduces the TVC concept and the evolution of this technology in the past three decades. Various geometries that were explored in TVC research are listed and their operating principles are explained. The review then categorically arranges the progress in computational studies applied to TVCs. Findings Analyzing extensive literature on TVCs the review discusses results of numerical simulations of various TVC geometries. Numerical simulations that were used to optimize TVC geometry and to enhance mixing are discussed. Reactive flow studies to comprehend flame stability and emission characteristics are then listed for different TVC geometries. Originality/value To the best of the authors’ knowledge, this review is the first of its kind to discuss extensively the computational progress in TVC development specific to gas turbine engines. Earlier review on TVC covers a wide variety of applications including land-based gas turbines, supersonic Ramjets, incinerators and hence compromise on the depth of analysis given to gas turbine engine applications. This review also comprehensively group the numerical studies based on geometry, flow and operating conditions.

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Section: Evolution Of Trapped Vortex Combustor Geometrymentioning

confidence: 99%

A review of computational studies on trapped vortex combustors for gas turbine applications

Narayanan

K.M.²

2022

AEAT

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“…UCC chambers were intended to solve the application of ITBs in tight spaces; however, their excellent combustion performance has led to their gradual adoption as an alternative to the main combustion chambers or combustion chamber geometries for turbine engines. UCC chambers are currently categorized into two main types: The first is known as the trapped-vortex combustor (TVC), which was first evaluated by Hsu et al and has been studied for decades owing to its simple geometry and good performance; , the second is known as the high- g combustor (HGC). Figure shows a schematic comparison of the two types of combustion chambers, both of which are designed with an annular cavity, which is used to generate and stabilize the vortex, the difference being that the axis of the vortex in the TVC is tangent to the circumference of the cavity, whereas the axis of the vortex in the HGC is aligned with the axis of the cavity …”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, Bohan et al , designed a cooling scheme by designing holes to form a cooling film and hence mitigate the localized overheating problem of the HGC. Zhang et al designed an asymmetric combustion chamber, and the experimental results showed that the combustion efficiency was greater than 94%. The combustion efficiency, dynamic pressure characteristics, and emissions were found to be affected by the inlet injection velocity, and the main combustion chamber volume and flame structure of the stabilizer had different degrees of influence on the combustion and stabilization characteristics.…”

Section: Introductionmentioning

confidence: 99%

Gear-Shaped High-g Combustion Chamber for Micro Turbojet Engine Applications

Huang,

Chen,

long

et al. 2024

ACS Omega

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Enhancing combustion efficiency and optimizing the thrust-toweight ratio are critical technical challenges encountered in the development, application, and growth of micro turbojet engines. The high-centrifugal (high-g) combustion chamber, as an innovative combustion chamber system, has the capability to replace the primary combustion chamber of the traditional turbojet engine, reducing the length of the combustion chamber while maintaining engine performance. Previous studies on the structure of the high-g combustor (HGC) have shown problems such as uneven temperature distribution of the turbojet rotor. To improve the feasibility of HGC integration into micro turbojet engines, this study conducts relevant experiments on a 120 N thrust engine. Subsequently, the results of these experiments were used to analyze the structural design of HGC through a simulation approach. Including six main configurations, the first four structural designs focused on establishing a suitable highly centrifugal environment to stabilize and improve the combustion performance, which was successfully achieved by designing the outer ring gearshaped inlet with four different angles. Subsequent structural designs were based around improving the uniformity of the temperature distribution at the combustion chamber outlet. The final design of the HGC combustion efficiency is not much different from the original combustion chamber, and it can shorten the axial length of the combustion chamber by nearly 30%. The design of the air inlet holes and the baffle plate effectively improves the temperature uniformity at the outlet of the combustion chamber. Moreover, without changing the combustion chamber material, the corresponding engine weight can be reduced by about 10.7%, and the engine thrust-to-weight ratio can be improved by up to 12% with the same thrust, which provides design ideas for further lightweight applications.

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“…ONITORING and characterising the stability of various fuels fired flames in furnaces has become more important than ever due to the recent trend of using a wide range of biomass, biofuels, and low-ranking coals [1]. An unstable flame can cause many combustion problems, such as furnace vibration, low combustion efficiency, high NOx emissions, and even flameouts [2]. In addition, the operation of power plants must be flexible in order to accommodate the intermittency of fluctuating demand by the users and increasing levels of renewable sources such as wind farms and solar stations.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Burner Flame Stability Through Digital Image Processing

Yan

Bai

2022

IEEE Trans. Instrum. Meas.

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Combustion and stability characteristics of ultra-compact combustor using cavity for gas turbines

Cited by 30 publications

References 37 publications

A review of computational studies on trapped vortex combustors for gas turbine applications

A review of computational studies on trapped vortex combustors for gas turbine applications

Gear-Shaped High-g Combustion Chamber for Micro Turbojet Engine Applications

Quantitative Assessment of Burner Flame Stability Through Digital Image Processing

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